docs: def mequ(m1):
      """
      Set one double precision 3x3 matrix equal to another.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/mequ_c.html
  
      :param m1: input matrix.
      :type m1: 3x3-Element Array of floats
      :return: Output matrix equal to m1.
      :rtype: 3x3-Element Array of floats
      """
      m1 = stypes.toDoubleMatrix(m1)
      mout = stypes.emptyDoubleMatrix()
      libspice.mequ_c(m1, mout)
      return stypes.cMatrixToNumpy(mout)